Derrick



(No Model.) l 4 Sheets-Sheet 1. W. E. CHAPMAN.

DBRRIGK.

No. 41 1,214. Patented Sept. 17, 1889.

Wcwwm/ ATTORNEYS.

(No Model.) 4 Sheets-Sheet 2. W. E. CHAPMAN.

DBRRIGK.

110.411,214. Patented Sept. 17, 1889.

(No Model.) 4 Sheets-Sheet 3. W. E. CHAPMAN.

DEER-IGK. No. 411,214. Patented Sept. 17, 1889,.

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(No Model.) 4 Sheets-Sheetl 4.

W. E. CHAPMAN.

. 111111111011. i 110.411.214. Patented sept. 17, 1889.

ATTORNEYS.

UNITED STATES PATENT OEEICE.

IVILIIIAM E. CHAPMAN, OF BROOKLYN, NEV YORK..

DERRICK.

SPECIFICATION forming part ef Letters Patent No. 411,214, datedSeptember 17, 1889.

Application filed April 10, 1889. Serial No. 306,713. (No model.)

.T a/ZZ whom, it may concern:

Be it known that I, WILLIAM E. CHAPMAN, of Brooklyn, in the county ofKings and State of New York, have invented a new and Improved Derrick,of which the following' is a full, clear, and exact description.

This invention relates to derricks, the object of the invention being toprovide a derrick that shall be applicable for use in the raising ofextremely heavy weights; and to the end named the invention consists inthe particular construction and arrangement of parts, as will behereinafter Inore fully described, and specifically pointed out in theclaims.

Reference is to be had to the accompanying drawings, 'forming apart ofthis speciiication, in which similar figures of reference indicatecorresponding parts in all the views.

Figure 1 is a perspective view of a derrick constructed in accordancewith the terms of Inyinvention. Fig.2isacentralscctionaleleva tion ofthe derrick-frame. Fig. 3 is afront View of the Aframe, the boom beingremoved and the float being shown in section. Fig. #1 is an enlargeddetail view of the lower end of the boom and the booIn-step. Fig. 5 is adetail view of the upper end ol' the boom, and Fig. t is a side viewofthe boom end.

In the specific construction shown in the drawings I have represented myimproved derrick as it would appear if mounted upon a float or scow;butI desire it to be understood that the der-rick might be mounted upona Vfixed base, or that it might be mounted upon a land conveyance.

In the drawings, represents a float or scow, upon which there is steppedan Aframe 100, said frame being made up of masts 11 and 11, which mastsare preferably formed from a number of longitudinal strips that areunited by binding hoops or bands 12, the parts being strengthened bycleats 13, that are held to place by sectional bands 14., the upperends-of the masts being connected in any desired manner, but preferablyfitting within a cap 15 and being spaced by a block 1G, as shown.

To the cap 15, I connect guyropes 17, which are secured to chainplates18, a proper tension upon the guy-ropes being secured through the mediumof turn-buckles 19, that are arranged as best shown in Figs. 1 and Inaddition to the guy-ropes 17, I provide forwardly-extending struts orbraces and rearwardly-extending struts or braces 21 and 21", as Inany ofthese struts being employed as may be deemed desirable or advisable.

Although not positively essential, I prefer to employ a stiffeningcross-piece 22, which is arranged as clearly shown in the drawings. Inconnection with the frame above de* scribed I employ a heavy boom 30,that is made from' a single stick or from a number ol' longitudinalsticks that are united by bands 31, outsideof which bands there arearranged strengtheningribs 32. To the lower end ot' the boom 30, Isecure straps each strap being formed with an eye 31 and the extendingends of all ofthe straps being bent over so that the eyes will register.The straps are bent, as best shown in Fig. 4, to receive the eye 35 ofthe swivel-bolt 3U, which bolt is stepped in a heavy bed-plate S7,Inounted upon a proper foundation 3S. Connection between the eyes 31 and35 is established by means of a heavy bolt 2. To the end of the boomthere are connected blocks 39 and 40, over the sheaves of which blocksthere is passed a heavy rope 4:1, which also runs over the sheaves ofablock 42, that is connected to the A-frame 100, the rope leadingbackward to a guiding-block that is carried by the A- frame and thencedownward to the windingdrum, any proper arrangement of blocks and ropesanswering' in this connection. To the end of the boom there is connecteda fall and tackle 4.3, to which the object to be raised is secured.Various falls for controlling the boom are arranged as may beconvenient.

Ey Ineans of such a derrick as the one above described I am able toraise very heavy weights, and, as I bring the weight beneath the apex efthe supporting-frame and above the center line or keel of the iioat, Iam able to maintain the equilibrium of the derrick.

III practice I employ water ballast, controlling said ballast in any ofthe well-known ways. This derriek has been employed to raise sunkenvessels bodily and to handle very heavy articles.

IOO

Having thus described my invention, I claim as new and desire to secureby Letters Patentl. The Combination, with the swiveled eye- 5 b0lt-3536, of the boom SO, the straps 33, secured to the boom and provided Witheyes 34 in their ends, the said ends being bent so that the eyes Willregister With each other and with the eye of the swivel-bolt, and thebolt Io 2, passed through the said eyes, substantially as described.

2. The combination, with an A-frame 100 and the swivel-bolt 3G, havingan eye 35 and arranged betweenthe masts ll l1a ofthe said frame, of theboom 30, the straps 33, having 15 eyes 34 in their ends and secured tothe boom by bands 3l, and the bolt 2, passing through said eyes,substantially as herein shown and described.

WILLIAM E. CHAPMAN.

\Vitnesses:

W. T. LETHBRIDGE, WM. C. ANDREWS.

